charts
Statically Provided Ticks Axes Example
Example:
/// Example of axis using statically provided ticks.
import 'package:flutter/material.dart';
import 'package:charts_flutter/flutter.dart' as charts;
/// Example of specifying a custom set of ticks to be used on the domain axis.
///
/// Specifying custom set of ticks allows specifying exactly what ticks are
/// used in the axis. Each tick is also allowed to have a different style set.
///
/// For an ordinal axis, the [StaticOrdinalTickProviderSpec] is shown in this
/// example defining ticks to be used with [TickSpec] of String.
///
/// For numeric axis, the [StaticNumericTickProviderSpec] can be used by passing
/// in a list of ticks defined with [TickSpec] of num.
///
/// For datetime axis, the [StaticDateTimeTickProviderSpec] can be used by
/// passing in a list of ticks defined with [TickSpec] of datetime.
class StaticallyProvidedTicks extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
StaticallyProvidedTicks(this.seriesList, {this.animate});
factory StaticallyProvidedTicks.withSampleData() {
return new StaticallyProvidedTicks(
_createSampleData(),
// Disable animations for image tests.
animate: false,
);
}
@override
Widget build(BuildContext context) {
// Create the ticks to be used the domain axis.
final staticTicks = <charts.TickSpec<String>>[
new charts.TickSpec(
// Value must match the domain value.
'2014',
// Optional label for this tick, defaults to domain value if not set.
label: 'Year 2014',
// The styling for this tick.
style: new charts.TextStyleSpec(
color: new charts.Color(r: 0x4C, g: 0xAF, b: 0x50))),
// If no text style is specified - the style from renderSpec will be used
// if one is specified.
new charts.TickSpec('2015'),
new charts.TickSpec('2016'),
new charts.TickSpec('2017'),
];
return new charts.BarChart(
seriesList,
animate: animate,
domainAxis: new charts.OrdinalAxisSpec(
tickProviderSpec:
new charts.StaticOrdinalTickProviderSpec(staticTicks)),
);
}
/// Create series list with single series
static List<charts.Series<OrdinalSales, String>> _createSampleData() {
final globalSalesData = [
new OrdinalSales('2014', 5000),
new OrdinalSales('2015', 25000),
new OrdinalSales('2016', 100000),
new OrdinalSales('2017', 750000),
];
return [
new charts.Series<OrdinalSales, String>(
id: 'Global Revenue',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: globalSalesData,
),
];
}
}
/// Sample ordinal data type.
class OrdinalSales {
final String year;
final int sales;
OrdinalSales(this.year, this.sales);
}